Meter.



PUBMED JULY 9, 190:1]

No. 859L883.

W. E. PRATT.

METER.

oTIoH FILED sBPT.21so6.

APPLE 3 SHEETS-SHBET L inventori Wil m prati.;

W itfrwesses:

TATTNTED JULY 9. 1907.

w. H. PRATT.

METER.

APPLIUATION FILED SEPT. 25.1905.

SHEETS-SHEET 2.

Inventor: WiHiamHpratt No. 859.333. I PATENTE) JULY 9, 1907.

w. H. FRATT. Y

METER.

AilJLIoATION FILED 81521225, 1905.

'3 SHEETS-SHEET s.

gi/messes: /m/enor.'

m1 im 'I Pam waag NITED STATES PATENT OFFICE., Q

WILLIAM II. PRATT, OF LYNN, MASSACHUSETTS, lASSIGNOR To GENERAL ELECTRIC COMPANY, A CORPORATION OF `NEW YORK.

METER.

Specification of Letters Alatent.

'Patented July 19, 1907. Y

. Application med separater 25,1905. sarai Ng. 279,889.

To all whom ity may concern: v Be it known that I, WILLIAM H. PRATT, a citizen of the United States, residing at Lynn, in the county of Essex, State of Massachusetts, have invented certain new and useful Improvements in Meters, of which the following is a specification.

' stance, the fields of permanent magnets and conductors connections.

traversed by currents in proximity to the meter.

The novel features of my invention will be'deinitely indicated in the claims appended hereto.

The details of construction and the mode of operation of my improved storage battery meter will be better understood by reference to the following description taken in connection with the accompanying drawings which show the preferred embodiment of the-invention and in which Figure 1 is a front view of the meter broken away in part; Fig. 2 is a side view broken away in part; Fig. 3 is a detail view of the gearing by which each of the movable elements is connected to its recording train; Fig. 4 shows an enlarged view in perspective'of a portion-ofthe same; and Fig. 5 is a diagram of the circuit I do not wish to be understood as limited to this type of field conductor however as a field coil of one or more turns may be used instead if desired.l

Extending throughopenings in the conductor 4, as

shown in Fig. 2, are two vertical shafts 5 and 6, inde,

pendently4 rotatable in suitable bearings; Each of these shafts carries an armature mounted for rotation in proximity to the conductor in the magnetic field which is established when current flows through'the conductor.

good electrical -contact In order to inake the meter astatic', that is independent of magnetic elds other than the field of the conductor 4, I make each of the two armatures Q'Aand 10 carried by the shafts 5 and 6, respectively, inrtwo parts and mount one part above and the other below the conductor4.

lA single commutator 7 is mounted on each shaft and the Y coilsoi the two-part armature are connected to the seg# ments thereof. vBrushes 8 bear on each commutator 7 to conduct the current to and from the armatures and connect armature 9 across the lines carrying the charg- -ing current .and the armature 10 across the secondaryv battery. The brushes 8 are carriedby pivotally mounted brush-holders 11 each provided with an arm 12 extending laterally from its pivot and having weights 13v wound on a hollow supporting member to form a sphere'.

The conductor 4 is hollowed outon its upper and lower sides about the openings for the shafts 5 and 6 and the parts of the two armatures are mounted upon the shafts so that they extend' into these hollowed out portions,

as this disposition of the parts makes the` lines of force 'A of the conductor 4,1nore effective in developing torques.'

Instead of a single armature divided into two parts and arranged as described, .two separate armatures on each shaft having individual commutatore may be employed though the former construction is preferred. In either case the two armatures or armature partsare so arranged that they both tend to rotate the shaft on which they are mounted in the same direction.

Adjustably mounted upon the conductor 4 are supports 14carryng coils 15 which are held in inductive relation to the varmature elemeutsand vconnected in series therewith to compensate for friction in the bearings of the shafts and in the dial trains. Extending upward from the conductor 4 is a supporting frame 1G carrying two dial trains I7, 17, each of which is adapted to be driven by one Of the Shafts 5, 6. 'For this purpose each shaft carries a worm 18 which meshes with a wormwheel 19 loose on a shaft 20 mounted in bearings formed in the frame 16 and an arm 28 secured thereto. On

shaft 20 is a ratchet Wheel 22 and on worm-wheel 19 isv a stud 23 carrying a leaf-spring actuating pawl 24 which engages'the teeth of the. ratchet wheel 22. A second ratchet wheel 29 is mounted on shaft 20 the teethof which extend in the same direction as those of ratchet "22. A retaining pawlBQis pivoted to a support lose-' a cured to arm 28 with its tooth bearing by gravity on l -the periphery of ratchet 29. A i,

` train by means ot' the crank 25 and arm 26,

On the 'end of the shalt 20 is arci-ank 25 adapted to engage an arm 2G carried by the first sha it 27 ol the dial train. lt will be seen that; with this arrangement ol the parts, when onerof-the shafts and the worm-wheel l?) driven thereby rotates linone direction, the actuating paw] 24 carried by the Worm wheel will engage the ratchet wh `eel 22 and cause'the shaft 20t0 rotate With 'the worm wheel 19 and thereby drive the recording In this case the pivoted` pa wl will slide loosely over 'the teeth of the ratchet wheel 29. But. when the shaft 2G and its worm-dicci rotate in the opposite direction the retainingl pawlii() by engaging a tooth of wheel 29 will prevent shaft 2() from rotating and the spring pawl 24 will move loosely over the teeth or' ratchet 22,

Supported onposts fil depending from the conductor t4 is a. plate 32 ol iron or other material of good'perineability through openings in which the shafts 5 and li extend. 33 of copper or aluminium which rotates inthe Iields of permanent magnets 34 held in suitable clamps 35. Each clamp 35 holds two magnets 34 and the unlike polesof these two magnets are on the same side of the disk 33 so that the magnets are astatically arranged.

Mounted above and below each oi the damping disks 33and en each side el the shafts 5 and 6 are shields 36 eech shaped like half a rectangle, as shown in dotted lines in Fig. 2 and each consistingof ay bundle el laminations of sheet metal oi good permeability, preferably soit iron. The shields above and below the magnets are separated by n short space in the plane oly the disk 33 so that the moving element can be withdrawn without removing the shields." VThe plate 32.

and the laminated shields 3G carry the lines ol' force ol stray lic/lds and vin 'that way 'protect the permanent magnets Si so that the damping clt'ect oi the magnets and the disks 315 is unal'iected by stray lines.` ol force. Considerable advantage is obtained by making tht-se shields Sti ol sheet ,metal laminations as such shields are 4opposite direction by current lios/intr i'rom the battery to thc translating devices 52 supplied thereby, In the ligure the conductor 4 is shown convcntionally in the manner employed to illustrate a lield windingr to indic-ate the fact tho-l; the current, in this conductor lurnishes the lieldlor the two meter elements. The. ar matures 9 and l0 are connected across the charging mains and acrossr the battery, respectively. When energy is supplied to the battery through conductor/l, both theshal'ts F) and li and the arnnttures car- .ricd thereby rotate but on account of the gearing: be. tween the shafts and their respective d iai trains i7 and the arrangementol' tho ratchet and pawl mechanisms as above described only one ol' the shafts, the one carrying the armature which is connected' across the charging lines,y will actuate its recording;r train as the shalt 2t) l'or driving the other dial train will be locked againstrotasite direction.

Below this plate each el the shafts carries a disk tion by its vpawl fill and ratchet 2l). which is actuated will therelorergive a registration of the euery-v supplied to the storage battery When the battery i coimectedto the translating devices current will ilow in the opposite direction in conductor 4 andv both armatures and their shafts will rotate in the oppoln this case the dial which registered the chase-incT energy will not be actuated bnl; will be locked against movement by its retaining pawl 30 and the other dial train Awill be actuaterhsinceits driving shalt 20 will be rotated by pawl 24 engaging a tooth of ratchet 22, the pivotedretaining pawl 30 sliding over the teeth of ratchet 2.( This latter dial `train driven by the shaft carrying the armature which is connected .across-the battery will thereiore register thel energy vsupplied by the battery.

The two dials thus integrate the chargingr and discharging energy independently. i

Furthermore it will be seen that 'the meter will be uninfiuenced by stray magneticV tiel ds as the dampingr mechanism is thoroughly shielded and as a stray' field tending to retardl or accelerate the speed of the upper part orY element'of either armature will have the opposite effect onv the lower one since the stray lield and the field of the' conductor 4 will act cumulatively on one arma-ture element and differentially on the other.

What I claim asnew and desire to secure by Letters Patentnf the nited States, is,

l 'e batteriv mct'er comprisingr a sing-lc tield conductor, two independently rotatable shafts. :in armature carried by each shaft injinductive relation to said field conductor` a dini train for cach Shaft. :1nd means cunnoctim; each shalt in driving relation to its dial train durin;r rotation of the slmtt in one direction.

The dial train' L. A stm-:nro battery meter comprising; n single ticld cnnduclor, two independently rfitatabie armatures in inductive relation lo said Iield conductor, :i shaft for eachy :Irina- Iurc, two dial trains, and moans coiincctin :ich shaft' in driving' relation to one of thc dial trains duringr rotation of the shaft in one direction and pci-'millingr the shaft to rotate in the opposite direction without actuating' the dial train, t

Il. A storage battery mcter comprising' two terminals, n bnr el' conducting; material connecting tbevlcrminnls, two armaturcsI mounted in proximity to said bnr. :i s'hnft for each armature. two dint trains. :1nd meal mncclint: each shaft in driving relation to ono oi'rthe dini trains .duringr rotation ot' the shal'tin one dircction.

l cach ol` said shafts one nbovc nml olio below suid har, two

diri trains. and means connor-tin.;r each shall to one of tin` dial trains illu-inf.: rotation ol' tiic shztt't in one direction.

tl. A stortte-c buttery motel' comprlsii :i slug-le tit-ld connrmntnrc cnrrictl by cach shnll in imlllcllvc l'clutiou lo sultl liehi conductor, :l dial lrnln l'or cach slnil't. a ratchcl :1nd pnwl connection hclwocn cach shal't' :Intl ils dial Ii'uin lo cnust. rolntionot' lhc shaft in one dircctlon to :icluzite its dini train, and :t ratchet and pnu'l vlo provi-nt actuation of the dial train wht-n its shzil'l is rolntingil iu lhc opposilt` diret4 lion.

T. ln :t mctcr, :in astatic motor comprising' a bnr of cnndur-tintr mult-rial cn 'ling the current lo bc. measured having nu opt-nim.r there!hrough'and depressions in the but" lill) at the ends of the opening, a rotatable shaft extending through the opening, and two spherical armature elements mounted ou the shaft one above und the other below the bar :1nd extending Into said depressions.

' S. In a meter, a motor mechanism, u dial train actuated thereby, u damping device comprising a plate of conducting material carried hy the shaft of the motor mechanism und n permanent muguet whose eld is cut by said plate, und a shield for said permanent magnet formed of laminolions of sheet metal secured together.

f). ln u. meter, a motor mechanism, a dial train actuated therehy,`a dumping device comprisingr n disk of conducting material carried by the shaft of the motor mechanism and `permanent magnets whose fields are cut by said disk, and' a1 housing for said magnets formed of laminations of sheet metal of goed permeability secured together, said housing having {1n-opening therein in the plane of the disk through which the disk may he wthdra'wn.

In .witness whereof, 1 havev hereunto set my hand this 

